You can't really just "find" more IPv4 though. Cloud platforms are eating blocks for breakfast, lunch and dinner, and while it's always going to be for sale, there's no reason to expect you'll be able to afford it.

Fortunately, if you can't afford IPv4 then no one else can afford it either, which means the incentive to adopt IPv6 is extremely strong and thus you no longer need IPv4.

Existing large ISPs and cloud providers with remaining IPv4 addresses and no IPv6 support are not going to have a strong incentive until after the damage is already done.

Why won’t Google, Cloudflare, AWS, etc. simply own all most IPv4 addresses and leave all end users using NAT (or even CGNAT) to access them? This cements their businesses, since then nobody can reasonably host their own servers except through them.